Does anyone know if cob pipes can be dyed, stained or painted some way? I'd love to get more information on learning how to dye the MM pipes to a dark brown or grey color. They seem to be sealed but I'd imagine that could be sanded off and then maybe they'd take a dye or stain of some kind? Also any specific type of stain or dye that would be appropriate for a pipe? Any sealers? I figure there's probably a lot of people wondering why spend time and effort on a $3-$10 pipe, but i think it would be a fun and cheap past time to spruce up cheap disposable pipes. I'll probably give it a try soon but wondering if anyone had tried it before and had some tips?